In order to improve the shielding performance of carbon fiber(CF)and realize wide-band application,carbon fiber hybrid materials(CF@Ni,CF@FeNi)were prepared by electroless plating on CF surface.Secondly,waterborne polyurethane(WPU)was used as matrix,and CF,CF@Ni and CF@FeNi were used as fillers in turn to prepare lightweight and flexible composites.At the same time,the electromagnetic shielding properties of the composites at 30-3000MHz and 10-100kHz were tested.The results showed that a dense and uniform metal layer was successfully deposited on the surface of carbon fiber,in which the saturation magnetization(Ms),remanent magnetization(Br)and coercivity(He)of CF@FeNi reached 10.02emu/g,0.76emu/g and 26.06Oe,respectively.Metal coating improved the electromagnetic shielding performance of carbon fiber and effectively improved its magnetic shielding performance in low frequency band.The peak shielding effectiveness of WPU@CF@FeNi at 30-3000MHz and 10-100kHz reached 26.9dB and 18.0dB,respectively when the addition of WPU@CF@FeNi was 9％.
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